Author Topic: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found  (Read 144636 times)

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Offline mrprecision

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #375 on: September 05, 2021, 06:32:22 am »
So I have checked it in detail.

Here are the screens, one with all samples and one with the MAG function (zoom):
(Attachment Link) (Attachment Link)

And here are exported raw data:
(Attachment Link)

So for me everything is fine.

hello mr precision

try to read several times, with only the command "DATA: START " , no need to use the command "DATA:STOP" , you need the "DATA: START " only for read the data from instrument

for example the first time
Code: [Select]
interfaceWrite("DATA:START 1");
the second time
Code: [Select]
interfaceWrite("DATA:START 2500");
the third time
Code: [Select]
interfaceWrite("DATA:START 5000");

change only the value of command "DATA: START" in your code and read several times


I don't understand how you should read out  more than 2500 samples. I only can readout the values for the timespan shown in the screen. Please read the programming manual. Anyhow, I have tried out interfaceWrite("DATA:START 2500"); this returns only value, like I expect. Its the last value.

So out of my point of view I could not improve anything.

 

Offline vittoles

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #376 on: September 21, 2021, 08:18:20 am »
Hi Sir,
did you get the info about pinout for the new DC/DC converter to replace the inverter?
best regards

Dan.
 

Offline zoiasso

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #377 on: October 29, 2021, 01:00:58 am »
Anyone know anyway to replace the bnc connector on THS720p? The service manual says the bnc is part of the chassis, but it looks like fited in there, im trying to figure out how to remove them. I have 2 scopes with plastic broken on the bnc connector that need replacement.
 

Offline 1audio

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #378 on: October 29, 2021, 05:15:51 am »
those connectors are a real problem. They are unique to that scope although similar connectors exist. Those have a special connector on the back that the coax fits into. If you want to maintain the full isolation these are designed to provide you need the plastic connectors and then I think you could just solder the cable from the board to the pins on the back of the connector. It would all be a little crude, but better than not being able to use the scope. I found the similar connectors from a vendor in China. I'll look for the info and post it if I can find it.
 

Online Fraser

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #379 on: October 31, 2021, 12:39:58 pm »
Does anyone have a spare CCFL inverter that I can purchase please ? I have a TH720A that came to me without the inverter :(

Fraser
If I have helped you please consider a donation : https://gofund.me/c86b0a2c
 

Offline 1audio

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #380 on: October 31, 2021, 04:46:32 pm »
I think I have one. However redoing the backlight with LED's works so much better and is not too hard.

Unfortunately you need to first boost the supply and then go to a regulator to drive the LED's.

PM me if you want the CCFL supply. I suspect the shipping from the US may be more than the LED parts from China.
 

Offline wingerr

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #381 on: December 14, 2021, 04:04:42 pm »
This is the description of the input section of the Tekscope, and I have an intermittent problem where channel 1 signal is at some negative saturated level offscreen, possibly out of common mode range.  Sometimes, but rarely, it will work normally when I turn it on, and the signal sits at zero as it should.  Has there been any components identified that could be causing this problem?  Since it's intermittent, it seems that something isn't being biased correctly, but when it works, it works 100 percent, with no middle ground.  Wondering if it might be a fractured solder joint, or maybe a failure of something like this:

Component number A1AT1
Tektronix part number 165–0034–00
Serial no. effective B030100
Name & description MICROCKT,HYBRID:ATTENUATOR/PREAMPLIFIER
Mfr.code TK2601
Mfr. part number 165–0034–00

THS720A MOD NV Component-Level Information Package
Component-Level Theory of Operation
This section describes the electrical operation of the THS720A MOD NV. Refer
to the schematics in the Component-Level Diagrams section as necessary.

Logic Conventions
This manual refers to digital logic circuits with standard logic symbols and
terms. Unless otherwise stated, all logic functions are described using the
positive logic convention: the more positive of the two logic levels is the high
(1) state and the more negative level is the low (0) state. Signal states may also
be described as “true” meaning their active state or “false” meaning their
non-active state. The specific voltages that constitute a high or low state vary
among the electronic devices.

Active-low signals are indicated by an asterisk (*) following the signal name,
for example IRQ*. Signal names are considered to be either active-high,
active-low, or to have both active-high and active-low states.

Oscilloscope System
Each of the two oscilloscope input signals enters the main board and passes
through an attenuator and preamplifier. Then each signal passes through an
isolation interface before reaching the trigger circuitry and sampler/digitizer. The
digitized signals are written into system memory for transfer to the display
system.
The acquisition system amplifies the input signals, samples them, converts them
to digital signals, and controls the acquisition process under direction of the
processor system. The acquisition system includes the trigger, acquisition timing,
and acquisition control circuitry.

Attenuators.  Circuitry in the attenuator selects the input coupling and
attenuation factor. The processor system controls the attenuators with a serial
interface as well as with DC control voltages.
The Main Board assembly contains two attenuator hybrids (AT1 and AT2). To
allow floating measurements, the attenuators are individually isolated from the
rest of the Main Board by an isolation interface. Power to the attenuators is
coupled through transformers. Opto-isolators couple control voltages and DC
control signals to each attenuator. Transformers couple the high-frequency signal
path from each attenuator to the main board. Opto-isolators couple the low-fre-
quency signal path from each attenuator to the main board.
Each attenuator hybrid contains two attenuators, an AC coupling capacitor, three
relays, three relay drivers, and a preamplifier. The AC/DC coupling relay couples
the output of the BNC to the other relays in the attenuator hybrid. For AC
signals, the AC/DC coupling relay inserts a coupling capacitor into the input
signal path. The second relay selects a X10 attenuation factor. The third relay
selects a X100 attenuation factor.

edit: Interestingly, I just had the scope powered up for a while, and the channel just recovered on its own without any action on my part-  I don't use the scope regularly, and maybe some part of the circuit is getting discharged from disuse.   I'll have to see if using it more regularly prevents this from occurring, or if the problem is just a Fluke-
« Last Edit: December 14, 2021, 04:10:49 pm by wingerr »
 

Offline zyxel13

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #382 on: May 09, 2022, 09:36:31 am »
Hello,

its quite some Time that news have been posted here, but did anyone managed to make a FW Update without de-soldering the Flash and loosing the calibration ?

Thankyou,
Cheers,
Konstantin
 

Offline vishaldotgupta

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #383 on: October 17, 2022, 12:19:22 pm »
i might have inverter for THS710A
 

Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #384 on: December 21, 2022, 05:30:50 pm »
Hello, I recently bought a THS710A. I am surprised that it is possible to "convert" it to the THS720P model, I would like to know if removing the resistors shown in the photo, the conversion is already done or there are other additional steps. Best regards!
 

Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #385 on: December 21, 2022, 05:40:43 pm »
Hello, in my case I also have the same problem, is a function generator necessary to correct this offset? or with a DC source enough?
 

Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #386 on: December 21, 2022, 06:22:07 pm »
Hello, I will not find the Metratek software available for download, could you please provide it?
About the display screen: Probably a change of polarizers is necessary, the procedure is simple (although time consuming)
 

Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #387 on: December 21, 2022, 07:00:27 pm »
Hi, how long does it work with those two 18650 batteries?
 

Offline little_grey

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #388 on: December 21, 2022, 07:04:03 pm »
Using the lithium cells will need the internal charger to be changed as currently its only nmhi at the moment.
 

Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #389 on: December 21, 2022, 07:21:51 pm »
It's not broken my friend, it's only the glue from the polarizers, you can remove them and carefully clean the screen with thinner (it took me about 3 hours of careful cleaning), then buy two 11.4 x 8 cm self-adhesive polarizers, both can be 90 or 0 degrees. Then, before peeling them to the screen, verify that the orientation is correct.
 

Offline little_grey

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #390 on: December 21, 2022, 07:48:03 pm »
On the subject of broken, does anyone want to buy a scope with a broken ocptocoupler if anyone is up for it
 

Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #391 on: December 21, 2022, 08:39:28 pm »
You can do tests using a 12V 1A linear charger (those that use transformer and wave rectifier by diodes)
 

Offline harrimansat

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #392 on: December 21, 2022, 08:57:36 pm »
It is pressure fitted, try to find Peltola to BNC
 131-1171-00.

https://www.ebay.com/itm/234579243572
 


Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #394 on: December 21, 2022, 09:55:26 pm »
try calibrating without 12v source
 

Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #395 on: December 21, 2022, 10:11:00 pm »
Hi! could you re-upload the program? It seems that it is not possible to download it anymore
 

Offline walter.aranda

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Offline walter.aranda

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #397 on: December 23, 2022, 11:22:53 am »
Hi!, what is the molex datasheet that does not match? what exactly does not match? I can help you look for it in my free time, but I would like to know that it does not match excactly, so that I can find it through sizing
 

Offline mk_

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Re: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
« Reply #398 on: December 23, 2022, 11:50:33 am »
Hi!, what is the molex datasheet that does not match? what exactly does not match? I can help you look for it in my free time, but I would like to know that it does not match excactly, so that I can find it through sizing

I have no idea to whom you answer in Reply 397... so...while answering in some kind of monolog it could be a great help for someone like me  using the quote-function and also the quote-tags.

TIA
 

Offline walter.aranda

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